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A convex lens of focal length 25 cm is p...

A convex lens of focal length 25 cm is placed at a distance `x` from a concave lens of focal length 7 cm. When a parallel beam is incident on the convex lens, it emerges as a parallel beam out of the concave lens. The value of `x` is

A

20 cm

B

18 cm

C

16 cm

D

14 cm

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